First measurement of the left-right Z cross section asymmetry in polarized e[sup +]e[sup [minus]] collisions at the SLC

Technical Report · Fri Jan 01 04:00:00 EST 1993

DOI:https://doi.org/10.2172/6888259· OSTI ID:6888259

Swartz, M L

The SLAC Linear Collider (SLC) has recently been upgraded to produce, accelerate, and collide a spin polarized electron beam. The average beam polarization during the 1992 run was (22.4 [plus minus] 0.7)%. The SLD Collaboration used the polarized beam to perform the first measurement of the left-right cross section asymmetry (A[sub LR]) for Z boson production by e[sup +]e[sup [minus]] collisions. The measurement was performed at a center-of-mass energy of 91.55 GeV with a sample of 10,224 Z decays. The measured value of A[sub LR] is 0.100 [plus minus] 0.044(stat.) [plus minus] O.004(syst.) which determines the effective weak mixing angle to be sin[sup 2][theta][sub W][sup eff] = 0.2378 [plus minus] 0.0056(stat.) [plus minus] 0.0005(syst.).

• Research Organization: Stanford Linear Accelerator Center, Menlo Park, CA (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 6888259
• Report Number(s): SLAC-PUB-6034; ON: DE93006955
• Country of Publication: United States
• Language: English

Related Subjects

662310* -- Weak & Electromagnetic Interactions of Leptons-- (1992-)
662440 -- Properties of Other Particles Including Hypothetical Particles-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATOR FACILITIES
ACCELERATORS
ASYMMETRY
BEAMS
BOSONS
CROSS SECTIONS
ELECTRON-POSITRON INTERACTIONS
ELEMENTARY PARTICLES
INTERACTIONS
INTERMEDIATE BOSONS
INTERMEDIATE VECTOR BOSONS
LEPTON-LEPTON INTERACTIONS
LINEAR ACCELERATORS
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
POLARIZED BEAMS
STANFORD LINEAR COLLIDER
WEINBERG ANGLE
Z NEUTRAL BOSONS